contains

Member is searched at k_x_list_members table either at gu_company and
gu_contact or tx_email. If list is Dynamic or Static, member is searched at
gu_company and gu_contact. If list is Direct or Black, member is searched at tx_email

Parameters:

oConn - Database Connection

sMember - If this is a Static or Dynamic list then sMember must be the GUID of Contact or Company searched.
If this is a Direct or Black list then sMember must be an e-mail address.

Returns:

true if sMember is contained in list.
Take into account that the member may be unactive or blocked and still be contained at the list.
Unactive (k_x_list_members.bo_active=0) and blocked (present at black list) members should not receive any e-mails.